Subtract
51Quote notation — is a representation of rational numbers for which the addition, subtraction, and multiplication algorithms are the same as for natural numbers, and division is easier than the usual division algorithm, and works in the same right to left… …
52Control table — This simple control table directs program flow according to the value of the single input variable. Each table entry holds a possible input value to be tested for equality (implied) and a relevant subroutine to perform in the action column. The… …
53One instruction set computer — Computer science portal A one instruction set computer (OISC), sometimes called an ultimate reduced instruction set computer (URISC), is an abstract machine that uses only one instruction – obviating the need for a machine language opcode …
54Carry flag — In computer processors the carry flag (usually indicated as the C flag) is a single bit in a system status (flag) register used to indicate when an arithmetic carry or borrow has been generated out of the most significant ALU bit position. When… …
55Mental calculation — comprises arithmetical calculations using only the human brain, with no help from calculators, computers, or pen and paper. People use mental calculation when computing tools are not available, when it is faster than other means of calculation… …
56Mechanical calculator — An old Russian mechanical calculator. A mechanical calculator is a device used to perform the basic operations of arithmetic. Mechanical calculators are comparable in size to small desktop computers and have been rendered obsolete by the advent… …
57Napier's bones — Computing devices in Rabdology Napier s bones Promptuary …
58Method of complements — Complement numbers on an adding machine c. 1910 In mathematics and computing, the method of complements is a technique used to subtract one number from another using only addition of positive numbers. This method was commonly used in mechanical… …
59Apollo Guidance Computer — and DSKY Invented by MIT Instrumentation Laboratory Manufacturer Raytheon Introduced August 1966 …
60Aid — For other uses, see Aid (disambiguation). Not to be confused with Ade, Aide, AIDS, or Ayd. Aiding redirects here. It is not to be confused with Ayding. Aid received, per capita, in 2007, in $ of Official Development Assistance per person. Note… …
